Pulverizer



(No Model.) 3 Shets-Sheet 1. P. W. GATES.

PULVERIZER.

N0. 380,432, I PafuentedApr. 3, 188-8.

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, 3 Sheets-Sheet 2. P. W. GATES. PULVERIZBR.

(No Model.)

No. 380,432. Patented Apr. 3, 1888.

(No Model.-) s Sheets-Sheet a. P. W. GATES.

PULVERIZER.

Patented Apr. 3, 1888.

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lUNi'Tnn STATES PATENT @rrrca.

PHILETUS XV. GATES, OF CHICAGO, ILLINOIS.

PULVERlZER.

SPECIFICATION forming part of Letters Patent No. 380,432, dated April 3, 1888.

Application filed Xovernbcr 3, 1887. Serial No. 254.145.

(No model.)

To all whom it may concern.-

Be it known that LPHILETUs W. Guns, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illi nois, have invented certain new and useful Im provements in Pulverizers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to pulverizers of that class shown in Patent No. 59,463 and dated November 6, 1866; and it consists in certain novel constructions, combinations, and arrangements of parts, as will be hereinafter described and specifically claimed, whereby the machine is greatly improved and rendered more effective in its operation.

In the accompanying drawings, Figure 1 is a side elevation of my improved pulverizer as adapted for dry pulverization. Fig. 2 is a longitudinal central section of the same. Fig. 3 is a perspective view of a revolving elevator which cooperates with the backward feed of my improved pulverizer. Fig. 4 isau end view of the pulverizer. Fig. 5 is a vertical transverse section of the same. Fig. 6 is a transverse section of the revolving elevator in the line a; a: of Fig. 2. Fig. 7 is an end view of an interchangeable head-piece for the pulverizer when adapted for wet crushing. Fig. 8 is a section of a portion of the pulverizer as provided with the head-piece shown in Fig. 7, this section being taken in the lineg y of Fig. 7. Fig. 9 is an elevation of one of theinner hollow crushing-rollers. Fig. 10 is an elevation of the other inner crushing-roller, the same being constructed to serve also as a back or return feeding device. Fig. 11 is an outline view of my pulverizer equipped for dry crushing, the feed operating mechanism being omitted.

The letter A in the drawings represents an outer case or inclosing hollow cylinder, G, an inner hollow pulverizing-roller of smaller diameter than the cylinder, and Hanother pulverizing-roller of smaller diameter than the roller G, and placed inside the roller G, and provided on its inside with a hollow screw, h, which serves as a back or return feeder. The cylinder Aand the rollers G and H are not constructed to be supported by central axles nor to revolve upon such axles, as from the description hereinafter hollow cylinder A is provided on with annular raised bearings a, which bear upon the periphery of supportingrollers a, said rollers being mounted by means of shafts a upon suitable standards, a", and they are provided with flanges cflwhcreby the cylinder A is held from longitudinal movement. The rollers a sustain the cylinder A and also the rollers G and H. A toothed rim, a, is fastened on head A,and into the same a pinion, d, of an operating counter-shaft D gears.

The counter-shaft D is provided with a pul ley, d, which is driven by an ordinary belt from a suitable motor. Near the pulley d a cannd", having steps d, is fastened to the counter-shaft D. A lever, I), pivoted at (i to a supportingstand, d bears with its lower arm, d, upon the surface of the cam d while with its higher arm, (1 it supports the swinging end portion of a chute, c, pivoted at e to the bottom portion of a hopper, E. As the cam d revolves, it, by its steps d, causes thelever D to vibrate intermittently on its pivot (1, and the lever D','by striking the chute e on its under side and then falling out of the way, causes the free end of said chute to rise and fall suddenly and the feed from the hopper to the cylder A to be facilitated.

In order to regulate the fall or drop of the free end of the chute c, a cord or strap, 6, is connected to its lower portion, which cord is passed up over a pulley, 6*, and from there down to a small adjusting-Windlass, 6. By winding more or less cord upon said Windlass or shafts, will appear given. The its periphery the free end of the chute will be more or less I elevated, and the inclination so changed that the chute will be moved correspondingly by the motions of the lever D, and thus its feeding capacity can at pleasure be increased or diminished.

The chute e partly enters the cylinder A through an opening, a, in the front head, A, the inner surface of which opening is provided with a screw-threadnflthis thread being righthanded when the revolution of the cylinder is left-hauded, as indicated by the arrow in Fig. 1. This construction of the opening a'* with the screw-thread (6 assists the feed into the cylinder A, and also prevents a backward escape of the contents of the cylinder through the opening a,such material as may be caused to fall back into the screw-threaded opening a being collected in the spiral channel formed by the screw-thread (t and guided and returned into the cylinder.

The cylinder Ais provided with a concentric removable lining of durable corrugated cylindrical metallic sections F, arranged to form parallel grooves f, Fig. 5,which serve as elevating and distributing buckets. The corrugations f of said sections are at right angles to the axis of the cylinder A, and serve as guides to similar matching corrugations,f", formed on the outer surface of the hollow pulverizing roller G,which revolves in the cylinder A. This hollow roller G is provided on its interior surface with corrugations f similar to those f on its outer surface and those 2:) f on the interior of the cylinder A. Atsuitmovable interchangeable heads J able intervals openings 9 are provided in the roller G for establishing communication from the exterior to the interior of the same. The corrugations) of the roller G serve as guides to the matching outer corrugations,f of the roller H, which revolves within the roller G. The corrugations f of the roller H are traversed by longitudinal grooves h, which serve as elevating-buckets, similarly to the groovef of the cylinder A. Similar longitudinal grooves, as h, may traverse the exterior corrugations, f, of the roller G for the purpose of forming buckets for elevating the material and carrying it from one side of the pulverizer to the other, and thus insuring its being brought repeatedly in contact with the crushing-surfaces. The hollow serewh of the roller H has its thread pitched to feed backward,or toward the feed hopper E, and by it such crushed material as is too large to be diseharged,or is not sufficiently pulverized when it arrives at the discharge-end of the pulverizer and accumulates in the space between the head. J or J and rear end of the cylinder Aand roller G, is conveyed back and discharged into the space between the head A and the receiving ends of the rollers G- H, so as to again pass between the pulverizing-surfaces and to the discharging end of the pulverizer.

I is an elevator fastened to the roller H and serving for dipping up and depositing the insulficiently-pulverized material into the roller H, so that it may be fed by the screw h back to the front end of the cylinder A, for the purpose above stated. The elevator I consists of a number of radial hollow arms,i,united at the axis of the roller H and having openings i communicating with the interior of the roller. The outer end portions of the arms i are provided with openingst' through which the material to be fed back passes from the cylinder A into the arms i in its passage into the roller H.

The cylinder A is provided with flanged re- J. The head Jis solid,'and has a central dischargeopening, j, and is used when crushing dry material, the more buoyant parts of which are disk j the water-pipe J h is carried back to the drawn out through the openingj by means of a fan, j, as illustrated in Fig. 11. By regulating the force of the draft by an ordinary sliding valvesuch as shown at fi-the withdrawal of the material from the cylinder A will be finer or coarser, as desired.

The head J, which is used for wet crushing that is, with a flowing stream of Water introduced through a pipe, J is constructed with an annular opening between its outer rim, 3, and central disk, f, its rim and disk being united by radial armsj, upon which wire-netting j is applied, as shown.

is inserted. When the head J is substituted for the head J, the sufficiently-pulverized material is discharged with the flowing water through the meshes of the wire-nettingj and the coarser parts re tained for return by the screw 72 for a further pulverizing action.

The material-such as stone or other sub stanceintroduced into the pulverizer may be of about nut size, and it may be dumped into the hopper or delivered by means of an ordinary chute from an ordinary rockcrusher to said hopper. tionsay for 'dry pulverization--the feed is operated with a given extent of oscillation of the chute c, and this continues until the material has worked its way to the discharge end of the cylinder A, into the hollow rollers G and H,an(l to the discharge end thereof, when the feed is adjusted and reduced to a more moderate rate by turning the Windlass eflas described, in order to avoid clogging and allow the cylinder and rollers to pulverize the first supply.

The material pulverized between the sectors F of cylinder A and roller G partly enters the grooves fand is carried up until discharged therefrom by reason of the inclination of said grooves, and in discharging upon the roller G the finer particles are freed from the coarser portions by means of the draft of the fanj. The coarser and heavier particles fall upon the roller G and pass through the openings 9 of the same into its hollow interior and in contact with roller H, where they are again subjected to a pulverizing action between rollers G and H.

The action of the fan j upon the sufficientlypulverized material is to draw it toward the rear end of the cylinder A and out of it,while the insufficiently-reduced portion, by reason of its weight and size, accumulates between the head J and the rollers, where it is dippedup by the arms t of the elevator I, delivered into the inner hollow roller, H, and by the screw feed end of the cylinder A, to be pulverized by again passing between the cylinder and the rollers G and H. The roller H has no perforations such as the roller G at g, and therefore delivers all the surplus material which is deposited into it by the elevator to the feed end of the cylinder A.v

The material of coarse grade by thus being separated from the sufficiently-pulverized ma- At the center of 3 In the beginning of the opera- ICO IIO

terial and returned by the screw h is kept from interfering with the discharge of the said sufficiently-pulverized portion by the fandraft, it being put in circulation inside the roller H in a backward direction, and outside said roller in a forward direction, and subjected in its forward movement to a further reducing action, which brings it to a condition for being discharged by the fan-draft.

In pulverizing with water, the fan j and head J are disconnected from the cylinder A and the head J and a suitable water-conduit are substituted; and the flowing water acts in the same manner upon the pulverized mate rial as the draft of the fan-that is, it carries oii" and discharges the portion of the material reduced to the required fineness.

The numherof intermediate rollers between the cylinder A and back feeding-roller, H, is not limited to one, as any number of rollers similar to roller G may be inserted into each other and interposed between the cylinder A and roller H without changing the principle of my invention; and since the roller H, with its interior return feeding screw, would operate just the same when in contact with the re ducing-surfa-ce of cylinder A as when in contact with the roller G, this roller H may be used without the roller G without departing from my invention.

The corrugated portions of the rollers may be made in sections similar to the corrugated sectors 13 of the cylinder A and suitably fastened to the main roller-bodies.

The pulverizer may also be made of any desirable length and the rollers G and H duplicated and arranged in a continuous line with out being coupled.

lVhat I claim is- 1. In a. pulverizer, the combination, with a surrounding reducing-surface, of a hollow roller provided with an exterior reducing-surface and with a return-screw on its inner surface, whereby the insufficiently pulverized substances can be returned from the discharging end to the feeding end of the pulverizer, andintroduocd again between the pulverizingsurfaces exterior of the return feeding-screw for further pulverization, substantially as described.

2. In a pulverizer, the combination of the cylinder A, the roller H, having an inner return feeding-screw, h, and an elevator, I, sub stantially as described.

3. In apulverizer, the combination of the cylinder A, roller H, having an innerrreturn feeding-screw, h, and a head with an outlet through which the sufficiently-pulverized materials are discharged, while the coarser substances are returned toward the feed end of 60 the pulverizer, substantially as described.

4. The revolving reducing-cylinder A, provided with the discharge-head J, comprising rim 9', central disk j coverings j of wiregauze, and water-pipe J in combination with the revolving reducing-roller H, having an inner return feeding-screw, substantially as described.

5. The combination of the revolving reducing-cylinder A, provided with the screw a in its feed-receiving opening a and with the head J, having wiregauzecovered dischargeopenings, and awater-pipe, J in combination with the revolving reducing-roller H, having an inner return feeding-screw, h, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

PHILETUS 'W. GATES.

Witnesses:

ALBERT J. GATES, Gno. VAN ZANDT. 

